when I let my bike idle, the left cylinder is dead, its only running off of the right cylinder. When I rev the bike, the left cylinder immediately kicks in and its running like there is no problem at all. checked the spark plugs, compression seems fine when its actually engaged. wheres the next place to look or what does this mean? By the way my names collin and I'm new here. I have an 81 xs650 that I chopped over the past few months.